Blueberry Strawberry Pavlova
Grease and lightly flour a cookie sheet. Make an 8" circle on the sheet.
Beat egg whites in bowl until soft peaks begin to form. Gradually beat in sugar, 1 tablespoon at a time and salt. Add vinegar and vanilla and beat until stiff peaks form.
Sift cornstarch over the meringue; fold in. Spread on cookie sheet within marked circle; spoon higher on sides to form hollow.
Bake in preheated very slow oven, 250 degrees, for 1 hour. Turn off oven; do not open oven door, leave meringue in oven 3 to 4 hours or until cool. Loosen from sheet with long spatula. Place on serving dish.
Fill meringue with berries.
Beat heavy cream and 1 tablespoon sugar until stiff. Pipe cream over fruit. Dust lightly with confectioners' sugar.